16.  


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Answer

 Option

In each triangle, the number at the apex of the triangle equals the average of the two numbers at the bottom.

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17.  


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Answer

 Option

In each diamond, add the left and right hand numbers together, and subtract this sum from the top number to give the value at the bottom.

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18.  


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Answer

 Option

In each row of the diagram, the central value equals the sum of the differences between the left hand pair of numbers and the right hand pair of numbers.

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19.  


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Answer

 Option

The inner digit in each segment equals the sum of the two numbers in the outer part of the opposite segment.

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20.  


4
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Answer

 Option

In each H shape, the central number is equal to the difference between the sum of the 3 left hand numbers and the sum of the 3 right hand numbers.

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